diff --git a/setup.py b/setup.py
index a9025e9..73822d5 100644
--- a/setup.py
+++ b/setup.py
@@ -20,4 +20,4 @@ setup(
             'ndsplines',
             'timeout_decorator',
             'tqdm',
-            'gymnasium'])
+            'gymnasium == 0.29.1'])